Skype history mistery

Hi All,
Recently i had some problems with deleting skype history.
After I have deleted everything on a PC (win7) and logged in on another PC (using same credentials) the skype is downloading everything I have already deleted before.
Why is that and how can I delete permanently something?
I have already turned off "skype cookies" and the history is set to "not creating history log"
Help me pls!
Thanks

agriboy1980--
This reference suggests two fixes, but it seems they do not work for everyone. See the very last post on page 2. Maybe you just have to wait for Skype to delete the messages.
http://community.skype.com/t5/Security-Privacy-Trust-and/Deleting-Clear-Chat-history/td-p/1228954

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